They've got a pile of perks, including signed copies, T-shirts, original art, and Skype visits.

Here's what the funds are going toward:

We're looking for enough greenbacks to print a
full-colour collector's edition of Ember's End. (It's gonna look real
purrrty.) The artist and author will also be paid for their work. More
importantly, we have several awesome stretch rewards in mind should we
surpass our funding goal. Will it be buttons? T-shirts? Airships for
everyone? Stay tuned.